Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

> Caliper Weights, Deciding where you want your un/semi-sprung weight
Eric_Shea
post Feb 27 2010, 06:30 PM
Post #1


PMB Performance
***************

Group: Admin
Posts: 19,289
Joined: 3-September 03
From: Salt Lake City, UT
Member No.: 1,110
Region Association: Rocky Mountains



I finally had the time, the proper scale and all of the calipers varieties around to do a little comparison weighing. All calipers are without pins, springs and pads.

And the winners are:

Brembo Calipers = 4lbs. 6oz. (front 911 strut 3" spacing, or early 914 strut w/o caliper spacers, or late 914 strut with ClubHub 48mm pistons, #109 Pad)
(IMG:http://www.914world.com/bbs2/uploads_offsite/www.pmbperformance.com-1110-1360942664.1.jpg)

S-Calipers = 5lbs. 6oz. (front 911 strut with 3.5" spacing, 48mm pistons #45 pad)
(IMG:http://www.914world.com/bbs2/uploads_offsite/www.pmbperformance.com-1110-1360943317.1.jpg)

L-Caliper = 5lbs. 6oz. (rear early 65-68 911 caliper with 2.25" spacing 35mm pistons, #30 pad)
(IMG:http://www.914world.com/bbs2/uploads_offsite/www.pmbperformance.com-1110-1360943317.2.jpg)

Wide L-Caliper = 5lbs. 10oz. (rear early 911S 67-68, 38mm pistons, #30 pad)
(IMG:http://www.914world.com/bbs2/uploads_offsite/www.pmbperformance.com-1110-1360943318.3.jpg)

911 Rear M-Caliper = 6lbs. 2oz (rear 911 69-83, 38mm pistons, #31 pad)
(IMG:http://www.914world.com/bbs2/uploads_offsite/www.pmbperformance.com-1110-1360943318.4.jpg)

914 Rear Caliper = 6lbs. 10oz. (rear 914 All, 33mm pistons, #30 pad)
(IMG:http://www.914world.com/bbs2/uploads_offsite/www.pmbperformance.com-1110-1360943319.5.jpg)

914 Front Caliper = 6lbs. 14oz. (front 914 all, 42mm pistons, #31 pad)
(IMG:http://www.914world.com/bbs2/uploads_offsite/www.pmbperformance.com-1110-1360943319.6.jpg)

M-Caliper = 7lbs. 6oz. (911 & 914-6 Front, can be used on early 914 w/o spacers, 48mm pistons, #31 pad)
(IMG:http://www.914world.com/bbs2/uploads_offsite/www.pmbperformance.com-1110-1360943319.7.jpg)

A-Caliper = 9lbs. 2oz. (911SC all front 3.5" spacing, 48mm pistons, #45 pad)
(IMG:http://www.914world.com/bbs2/uploads_offsite/www.pmbperformance.com-1110-1360943320.8.jpg)

Wide A-Caliper = 9lbs. 4oz. (911 Carrera all 3.5" spacing, 48mm pistons, #45 pad)
(IMG:http://www.914world.com/bbs2/uploads_offsite/www.pmbperformance.com-1110-1360943320.9.jpg)
[same picture as above... just has 4mm wider spacers.]

Couple of things to note. The very lightest calipers and the very heaviest calipers share the same 48mm pistons and "almost" the same size pad. The 109 pad is the same pad as the BMW 320i... just as wide as the #45 pad but a couple of mm shorter.

Stands to reason a 3" 911T/914-6 strut with Brembo's is the lightest most effective system in this batch. Looking at the top and the bottom... you could shave almost 10lbs. of un-sprung/semi-sprung weight off your suspension and get the same performance!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
2 Pages V  1 2 >  
Reply to this topicStart new topic
Replies(1 - 19)
ConeDodger
post Feb 27 2010, 06:36 PM
Post #2


Apex killer!
***************

Group: Members
Posts: 23,853
Joined: 31-December 04
From: Tahoe Area
Member No.: 3,380
Region Association: Northern California



mmmmmmmmm.... Mine are the lightest! Yaaaa!!!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Chris Hamilton
post Feb 27 2010, 08:23 PM
Post #3


Senior Member
***

Group: Members
Posts: 611
Joined: 7-March 06
From: Berkeley, CA
Member No.: 5,687



Those brembos are great. Light weight and cheap! I got some from the junkyard for my 912.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
andys
post Feb 28 2010, 10:50 AM
Post #4


Advanced Member
****

Group: Members
Posts: 2,165
Joined: 21-May 03
From: Valencia, CA
Member No.: 721
Region Association: None



Eric,

These are the combined weight of two calipers, correct?
I've got the Carrera calipers and knew they were heavy even without something to compare to.

Andys
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Eric_Shea
post Feb 28 2010, 11:05 AM
Post #5


PMB Performance
***************

Group: Admin
Posts: 19,289
Joined: 3-September 03
From: Salt Lake City, UT
Member No.: 1,110
Region Association: Rocky Mountains



QUOTE
These are the combined weight of two calipers, correct?


No... that's one caliper.

I never have been a fan of those calipers on a 914 for the weight reason. They are fine calipers and pretty much a staple in the Porsche line-up since 1978 but there's a couple issues that make me not want them on my car:

1. The rotors are the 24mm vented rotor. This adds weight beyond the 20mm standard vented rotor. Rotational Mass is the last place you would want to add weight. I have "never" heard of a 914 that is braking properly that has ever experienced fade on a 20mm vented rotor. If you check the historics and the HSR 2 Litre Challenge, all of those cars are wheel to wheel racing... HARD... on 20mm rotors and 908/S-Calipers.

2. The weight of the caliper - As you can see, the S-Caliper is a full 8lbs lighter (we're talking pair now) and it has the same piston and pad area. S-Caliper pads are actually thicker for racing purposes.

That said, some say the S-Calipers flex. I have yet to experience this on any S-Calipers that I've had. I've gone through pad bedding procedures that left the brakes smoking and I was "looking" for flex at the time. I dub thee an "Internet Myth"... YMMV
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Krieger
post Feb 28 2010, 12:59 PM
Post #6


Advanced Member
****

Group: Members
Posts: 4,769
Joined: 24-May 04
From: Santa Rosa CA
Member No.: 2,104
Region Association: None



This is great info. Thanks. So I have my A calipers apart and they are very clean inside. The spacers that are in the centers are about 11mm thick. Are these considered wide A or regular?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Eric_Shea
post Feb 28 2010, 01:00 PM
Post #7


PMB Performance
***************

Group: Admin
Posts: 19,289
Joined: 3-September 03
From: Salt Lake City, UT
Member No.: 1,110
Region Association: Rocky Mountains



Those are Wide A-Calipers. (what's with the "Andys" and the Carrera calipers?) (IMG:style_emoticons/default/biggrin.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Krieger
post Feb 28 2010, 01:05 PM
Post #8


Advanced Member
****

Group: Members
Posts: 4,769
Joined: 24-May 04
From: Santa Rosa CA
Member No.: 2,104
Region Association: None



That's the luck of the $40 swap meet find. A is for Andy anyway! (IMG:style_emoticons/default/biggrin.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Krieger
post Feb 28 2010, 01:12 PM
Post #9


Advanced Member
****

Group: Members
Posts: 4,769
Joined: 24-May 04
From: Santa Rosa CA
Member No.: 2,104
Region Association: None



So Eric, what is the difference between a 914/4 and /6 rear rotor? Diameter? I know the 4s are 1mm thicker and about half the price. I just need to drill some holes for the studs to pass through. I was thinking this may be a better way to go for my application.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
scotty b
post Feb 28 2010, 01:18 PM
Post #10


rust free you say ?
***************

Group: Members
Posts: 16,375
Joined: 7-January 05
From: richmond, Va.
Member No.: 3,419
Region Association: None



QUOTE(Chris Hamilton @ Feb 27 2010, 06:23 PM) *

Those brembos are great. Light weight and cheap! I got some from the junkyard for my 912.


What do they come on ? (IMG:style_emoticons/default/confused24.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Eric_Shea
post Feb 28 2010, 02:47 PM
Post #11


PMB Performance
***************

Group: Admin
Posts: 19,289
Joined: 3-September 03
From: Salt Lake City, UT
Member No.: 1,110
Region Association: Rocky Mountains



QUOTE
what is the difference between a 914/4 and /6 rear rotor? Diameter? I know the 4s are 1mm thicker


Diameter, not thickness. Once you machine the holes in the -4 rotors you're about even cost wise.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Katmanken
post Feb 28 2010, 04:42 PM
Post #12


You haven't seen me if anybody asks...
****

Group: Members
Posts: 4,738
Joined: 14-June 03
From: USA
Member No.: 819
Region Association: Upper MidWest



Dang,

I'm gonna drill mine full of lightening holes, go with hollow core pistons, and add small helium balloons.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jmill
post Feb 28 2010, 04:55 PM
Post #13


Green Hornet
****

Group: Members
Posts: 2,449
Joined: 9-May 08
From: Racine, Wisconsin
Member No.: 9,038
Region Association: Upper MidWest



Damn. I need some S calipers. My A's are boat anchors.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Chris Hamilton
post Feb 28 2010, 07:42 PM
Post #14


Senior Member
***

Group: Members
Posts: 611
Joined: 7-March 06
From: Berkeley, CA
Member No.: 5,687



QUOTE(scotty b @ Feb 28 2010, 11:18 AM) *

QUOTE(Chris Hamilton @ Feb 27 2010, 06:23 PM) *

Those brembos are great. Light weight and cheap! I got some from the junkyard for my 912.


What do they come on ? (IMG:style_emoticons/default/confused24.gif)



Various old italian cars. I got mine from an Alfa. They were like $40 a side. I had to go through them before I could put them on the car though.

They look like this
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
sixnotfour
post Feb 28 2010, 07:58 PM
Post #15


914 Wizard
**********

Group: Members
Posts: 10,681
Joined: 12-September 04
From: Life Elevated..planet UT.
Member No.: 2,744
Region Association: Rocky Mountains



mine look like this PMB style


Attached image(s)
Attached Image Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Chris Hamilton
post Feb 28 2010, 08:02 PM
Post #16


Senior Member
***

Group: Members
Posts: 611
Joined: 7-March 06
From: Berkeley, CA
Member No.: 5,687



Wow those look nice!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Chris Pincetich
post Mar 1 2010, 10:50 AM
Post #17


B-)
****

Group: Members
Posts: 2,082
Joined: 3-October 05
From: Point Reyes Station, CA
Member No.: 4,907
Region Association: Northern California



Nice (IMG:style_emoticons/default/beerchug.gif)
Eric - do you stock rebuild Brembos that look that nice?
Wonder what rear caliper Brembo options are out there, maybe with an e-brake??
(IMG:style_emoticons/default/smile.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
ConeDodger
post Mar 1 2010, 12:17 PM
Post #18


Apex killer!
***************

Group: Members
Posts: 23,853
Joined: 31-December 04
From: Tahoe Area
Member No.: 3,380
Region Association: Northern California



It was almost a shame to cover them up with wheels... Until I stood on the brakes the first time!


Attached image(s)
Attached Image Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
campbellcj
post Mar 1 2010, 11:06 PM
Post #19


I can't Re Member
****

Group: Members
Posts: 4,593
Joined: 26-December 02
From: Agoura, CA
Member No.: 21
Region Association: Southern California



Anybody got weights for the Boxster calipers? I may be heading in that direction if I follow-through with my latest crazy plans.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Eric_Shea
post Mar 2 2010, 02:10 AM
Post #20


PMB Performance
***************

Group: Admin
Posts: 19,289
Joined: 3-September 03
From: Salt Lake City, UT
Member No.: 1,110
Region Association: Rocky Mountains



QUOTE
Eric - do you stock rebuild Brembos that look that nice?


I usually stock a pair or two of those.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post

2 Pages V  1 2 >
Reply to this topicStart new topic
4 User(s) are reading this topic (4 Guests and 0 Anonymous Users)
0 Members:

 



- Lo-Fi Version Time is now: 27th December 2024 - 02:13 AM